We examine the spillover effects of recreational marijuana legalization (RML) in Colorado and Washington on neighboring states. We find that RML causes a sharp increase in marijuana possession arrests in border counties of neighboring states relative to non-border counties in these states. RML has no impact on juvenile marijuana possession arrests but is rather fully concentrated among adults. We do not find evidence that marijuana sale/manufacture arrests, DUI arrests, or opium/cocaine possession arrests in border counties are affected by RML.
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